Apparatus for lifting out and cleaning centrifugal drums



1927' K. J. svENssoN El l- APPARATUS ron mm our AND cue/mm caumxruonn-nauus Filed Oct. 4. 1926 In Uenl'ons.

Patented July 12, 1927.

UNITED STATES PATENT j OFFICE;

KARL JOHAN svnnsson', or mmneo VILLAS'IAD, am) KARL AXED PATRIK routine,"

or son aRronitsvILLAs'rAn, SWEDEN.

APPARATUS FOR LI-ITING OUT AND CLEANING CENTBIFU'GAL DRUMS.

Application filed October 4, 1926 Serial No. 139,441,- and in Sweden October 13, 1925.

Then submitting to centrifugal treatment a hard and compact layer whiclrmust'be scraped off or broken loose before itcanbe removed, and generally, this cannot be done conveniently in vertical centrifugal appara-- tile with the drumremaining in the machine body; so that the drum has togbe lifted out and tilted toa predetermined angle. It is desirable that the drum, or that part thereof which contains the separated solids,

should be, tilted to such-an extent that the solids scraped ofl from the walls of the drum can be poured out together with any liquid remaining therein.-

For large centrifugal lrums which are in-' convenient. to lift out from, the body hand, a mechanical hoisting device of some suitable kindi must be used, but it is difiicult to make suitable apparatus for gripping the drum or its heavy parts in such a way that it will be easy to tilt them and secure Various means have been constructed for this purpose but they all present disadvantages, as for in stance, that the drum must first be lifted out and placed in a special apparatus or that the lifting device is secured to the outside of the drum. The former method requires extra space to be available in the neighbourhood of the apparatus and the latter that the machine body must be made so large that the device can pass between the body and the drum.

The present invention has for its object, a device for gripping a Vertical centrifugal drum, or the. part thereof containing the separated solid impurities, in such a manner that the drum when being lifted out of the machine body has, always, a tendency to remain vertical but at the same time may be tilted over easily to any required angle from 0 up to over 90.

According to this invention a link which is adapted at its upper end to. be secured to a suitable hoisting arrangement, and at its lower end to be secured to the drum or a part thereof, is so arranged that the latter connection is efiected within the drum and so that pivotal movement may take place about a horizontalanis situated in a vertical plane in which lies the centre of gray ity of the drum or drum part and at a suitable distance thereabove, the link being cranked towards one sidein such a manner that the top edge of the drum or drum part can pass considerably over the line between the ends of the link so that the said drum or drum part alwayshas a tendency to remain in a vertical position when being lifted out, but may be tiltedover easily to any required angle.

One form of the invention is illustrated by the accompanying drawings whereof Figure 1 is a side elevation of the deviceap-p plied to the bottom part of a drum shown in section, Figure 2 is a. plan View thereof,- a side elevation showing the and Figure device in use, the drum part shown in these figures being of a well known type having a centre part upstanding from the bottom and bored out from beneath to receive the lies the centre of gravity of the drum. part said pintles engaging apertures in the limbs of the bifurcated end of a cranked link 9 the upper end of which is provided with a ring or the like 7iv for the attachment of the device to a hoisting arrangement (not shown). The cranking of the link 9 and the pivotal arrangement of the clamp 0 makes it possible to tilt the drum part a one side so that its upper edge can, to a considerable extent, pass over the line between the suspension ring it and the pintles e, e, as shown in Figure 3 where the drum part a is tilted over as much as the shape of the link 9 permits, which is more than 90. Consequently, the impurities and any liquid remaining in the drum part a can be poured out while said part is suspended by the apis inserted in the bore of the upstanding centre part b, which bar is provided at its free end with a chain is or the like havin a number of rings or loops such as m fixed thereto at different distances from the end of the bar 7'. By threading one of these rings on the hook it of the hoisting arrangement, the drum part a can be tilted and secured at any angle suitable for Cleaning.

By making the clamp 0 so that it surrounds the centre part Z) without undue pressure, the drum part a can be swivelled about its axis even in an inclined position, which facilitates the cleaning. As the pintles e e are situated above the centre of gravity of the drum part a the latter will always be in stable vertical equilibrium when lifted out of the machine and by making the distance between said pintles and centre of gravity short the tilting force required will be slight, especially if a bar be used as shown in Figure 3.

The present invention is not, however, limited to the device shown in the drawings but, obviously, can be varied in detail in accordance with the design of the drum. Instead of the clamp 0 with horizontal pintles e, e, the centre part 3) could be formed with a through-hole for a pin or the like passing through the holes in the bifurcated end of the link 9, or formed with two diametrically opposed holes near its lower end, in which could be inserted, sliding pins or screws fitted to the bifurcated end of the link 9.

Instead of a single link with a bifurcated end, two separate links suitably shaped and secured together may be employed.

a vertical centrifugal drum or that part thereof in which the separated solid impurities accumulate, comprising a single bifurcated link cranked towards one side and adapted at its upper end to be secured to a suitable hoisting arrangement, and means at the lower end of said link adapted to be secured to a part of said drum inside the latter, said means being movable about a horizontal axis which is situated in a ver tical plane in which lies the centre of gravity of the drum and which is situated at a suitable distance above said centre of grav it 2. In combination with a device for lifting out and cleaning a vertical centrifugal drum or drum part, as claimed in claim 1, the drum being formed with a bore to receive a loose driving spindle, a bar adapted to be inserted in said bore and provided with means adapted adjustably to be fixed relatively to the upper suspension point of the device so that the drum can be secured in any desired inclined position during cleaning.

KARL'JOHAN SVENSSON. KARL AXEL PATRIK NORLING. 

